<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <template id="root">



    </template>
    <script>
        //创建应用实例
        const app=Vue.createApp({
            template:"#root",
           data(){
            return{
                message:"hello vue"
            }
           }
        })
      const root=  app.mount("#app")
    </script>
</body>
</html>